Adaptively tunable antennas and method of operation therefore
First Claim
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1. An apparatus, comprising:
- a directional coupler connected at an input port of a tunable antenna to obtain parameters for determining an input return loss, wherein the directional coupler is directly connected at the input port without additional RF components being connected between the directional coupler and the input port of the tunable antenna; and
a closed loop control system adapted to sense RF voltage across a variable reactance network and generate bias signals based at least in part on the input return loss, wherein the bias signals are configured for causing an adjustment of one or more tunable reactive elements of the variable reactance network to adjust the RF voltage, wherein the variable reactance network is connected on the antenna.
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Abstract
An embodiment of the present invention is a method, comprising improving the radiated harmonic distortion of a transmitting antenna system by sensing the RF voltage present on a variable reactance network within the antenna system; controlling the bias signal presented to the variable reactance network; and maximizing the RF voltage present on the variable reactance network.
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Citations
20 Claims
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1. An apparatus, comprising:
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a directional coupler connected at an input port of a tunable antenna to obtain parameters for determining an input return loss, wherein the directional coupler is directly connected at the input port without additional RF components being connected between the directional coupler and the input port of the tunable antenna; and a closed loop control system adapted to sense RF voltage across a variable reactance network and generate bias signals based at least in part on the input return loss, wherein the bias signals are configured for causing an adjustment of one or more tunable reactive elements of the variable reactance network to adjust the RF voltage, wherein the variable reactance network is connected on the antenna. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for a communication device, comprising:
a control system operable to; sense an RF voltage across a variable reactance network connected on a tunable antenna; and adjust a reactance of the variable reactance network to adjust the RF voltage, wherein the control system uses an algorithm implemented on a digital processor to adjust the RF voltage, wherein the control system comprises a directional coupler connected at an input port of the tunable antenna, wherein the control system is operable to increase the RF voltage, and wherein the directional coupler is directly connected at the input port without additional RF components being connected between the directional coupler and the input port of the tunable antenna. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for tuning an antenna, the apparatus comprising:
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a memory; and a controller coupled with the memory and operable to; obtain an RF voltage across a variable reactance network operably coupled with the antenna and the controller, and adjust a reactance of the variable reactance network to adjust the RF voltage based on an input return loss determined from parameters obtained by a directional coupler connected at an input port of the antenna, wherein the directional coupler is directly connected at the input port without additional RF components being connected between the directional coupler and the input port of the antenna. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification